Under high temperature, vegetable farmers must try to avoid the high temperature period of spraying agents, because many agents in high temperature period of use, the effect will be greatly reduced, and even appear drug harm. Next, I would like to share with you a few pesticides that are prone to harm under high temperature.
1.abamectin
Abamectin can be used to control pests on rice, apples, oranges, watermelons, cucumbers, string beans and other crops. When abamectin is used at about 20℃, the effect is good, but special attention should be paid to not using it at high temperature, especially when it is used above 38℃. It is very prone to drug harm, resulting in malformation, spots and stop growth of crop leaves.
2.pyraclostrobin
pyraclostrobin, is a broad-spectrum fungicide, healing, protection, in crop seedling, crop growth period and high temperature (37 ℃) and high humidity conditions, pyrazole ester ether bacteria have the function of plant health, but if you use the concentration is too high, can appear the adr risk, is likely to be responsible for the crop leaf burning phenomenon.
3.Nitenpyram
It is mainly used for the prevention and control of prickle-sucking pests. It can be used on rice, wheat, apple, citrus, pear, grape, cucumber, eggplant, tomato, tea and other crops. It is easy to cause drug harm when using endithyamine at high temperature, so when spraying, it is best to avoid high temperature and choose spraying time period below 30℃, so as to avoid burning leaves and other phenomena.
4.Chlorfenapyr
Chlorfenonil is a broad-spectrum insecticide, especially effective against lepidoptera pests (rapeseed, beet armyworm, etc.). Chlorfenapyr, suitable temperature 20-30 degrees, the best effect. However, the use of chlorfenonil at high temperature is likely to give leafy crops in the leafy vegetables (such as green vegetables, Shanghai green, spinach), bring leaf burning phenomenon; There are also serious drug hazards in grape species, such as European beauty finger, white mare’s milk, and the tender leaves on the ruby seedless top.
5.fluazinam
fluazinam, higher fungi and lower fungi have a good effect, can prevent and control vegetables and fruit tree diseases, such as downy mildew, gray mold, anthrax, black star disease; The prevention effect of blight, root-swollen disease and gray mold is relatively prominent, but also can prevent and control mite pests, such as orange spider (adult, egg), the prevention and control effect is good.
fluazinam, when used at high temperatures, increases the chance of harm because fluridine is highly reactive and permeable, and when used at high temperatures, it accelerates evaporation of water, which increases the concentration of the liquid.
Grapes, cucumbers can not be used on crops, once used, extremely easy to drug harm!
6.Acetylene mites
Acetylene mites, low toxic acaricide, with touch and stomach toxicity, no internal absorption and osmotic conduction. Effective to adult mites, nymphs, egg killing effect is poor. General use of acetylene mite above 20℃, the effect is good, but above 25℃, crops are very easy to produce sunburn disease, but also affect the fruit around the umbilical chlorosis.
7.Diafenthiuron
Diafenthiuron is a new type of thiourea insecticide and acaricide with high efficiency and egg killing effect. Good control effect on mites (tetranychus mites, rust mites), aphids, mealworms, leafhoppers and various moth pests on citrus, apple, cotton, vegetables, tea and ornamental plants. Under high temperature period (above 30℃) and high humidity condition, butylfenuron is easy to produce drug harm to crop seedlings.
Post time: Apr-25-2022